asm.h revision 66633
1/* $FreeBSD: head/sys/ia64/include/asm.h 66633 2000-10-04 17:53:03Z dfr $ */ 2/* From: NetBSD: asm.h,v 1.18 1997/11/03 04:22:06 ross Exp */ 3 4/* 5 * Copyright (c) 1991,1990,1989,1994,1995,1996 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 29/* 30 * Assembly coding style 31 * 32 * This file contains macros and register defines to 33 * aid in writing more readable assembly code. 34 * Some rules to make assembly code understandable by 35 * a debugger are also noted. 36 * 37 * The document 38 * 39 * "ALPHA Calling Standard", DEC 27-Apr-90 40 * 41 * defines (a superset of) the rules and conventions 42 * we use. While we make no promise of adhering to 43 * such standard and its evolution (esp where we 44 * can get faster code paths) it is certainly intended 45 * that we be interoperable with such standard. 46 * 47 * In this sense, this file is a proper part of the 48 * definition of the (software) Alpha architecture. 49 */ 50 51/* 52 * Macro to make a local label name. 53 */ 54#define LLABEL(name,num) L ## name ## num 55 56/* 57 * MCOUNT 58 */ 59 60#if !defined(GPROF) && !defined(PROF) 61#define MCOUNT /* nothing */ 62#else 63#define MCOUNT \ 64 .set noat; \ 65 jsr at_reg,_mcount; \ 66 .set at 67#endif 68 69/* 70 * ENTRY 71 * Declare a global leaf function. 72 * A leaf function does not call other functions. 73 */ 74#define ENTRY(_name_, _n_args_) \ 75 .global _name_; \ 76 .align 16; \ 77 .proc _name_; \ 78_name_:; \ 79 .regstk _n_args_, 0, 0, 0 \ 80 MCOUNT 81 82#define ENTRY_NOPROFILE(_name_, _n_args_) \ 83 .global _name_; \ 84 .align 16; \ 85 .proc _name_; \ 86_name_:; \ 87 .regstk _n_args_, 0, 0, 0 88 89/* 90 * STATIC_ENTRY 91 * Declare a local leaf function. 92 */ 93#define STATIC_ENTRY(_name_, _n_args_) \ 94 .align 16; \ 95 .proc _name_; \ 96_name_:; \ 97 .regstk _n_args_, 0, 0, 0 \ 98 MCOUNT 99/* 100 * XENTRY 101 * Global alias for a leaf function, or alternate entry point 102 */ 103#define XENTRY(_name_) \ 104 .globl _name_; \ 105_name_: 106 107/* 108 * STATIC_XENTRY 109 * Local alias for a leaf function, or alternate entry point 110 */ 111#define STATIC_XENTRY(_name_) \ 112_name_: 113 114 115/* 116 * END 117 * Function delimiter 118 */ 119#define END(_name_) \ 120 .endp _name_ 121 122 123/* 124 * EXPORT 125 * Export a symbol 126 */ 127#define EXPORT(_name_) \ 128 .global _name_; \ 129_name_: 130 131 132/* 133 * IMPORT 134 * Make an external name visible, typecheck the size 135 */ 136#define IMPORT(_name_, _size_) \ 137 /* .extern _name_,_size_ */ 138 139 140/* 141 * ABS 142 * Define an absolute symbol 143 */ 144#define ABS(_name_, _value_) \ 145 .globl _name_; \ 146_name_ = _value_ 147 148 149/* 150 * BSS 151 * Allocate un-initialized space for a global symbol 152 */ 153#define BSS(_name_,_numbytes_) \ 154 .comm _name_,_numbytes_ 155 156 157/* 158 * MSG 159 * Allocate space for a message (a read-only ascii string) 160 */ 161#define ASCIZ .asciz 162#define MSG(msg,reg,label) \ 163 addl reg,@ltoff(label),gp;; \ 164 ld8 reg=[reg];; \ 165 .data; \ 166label: ASCIZ msg; \ 167 .text; 168 169/* 170 * System call glue. 171 */ 172#define SYSCALLNUM(name) \ 173 SYS_ ## name 174 175#define CALLSYS_NOERROR(name) \ 176 mov r15=SYSCALLNUM(name); \ 177 break 0x100000 ;; 178 179/* 180 * WEAK_ALIAS: create a weak alias (ELF only). 181 */ 182#ifdef __ELF__ 183#define WEAK_ALIAS(alias,sym) \ 184 .weak alias; \ 185 alias = sym 186#endif 187 188/* 189 * Kernel RCS ID tag and copyright macros 190 */ 191 192#ifdef _KERNEL 193 194#ifdef __ELF__ 195#define __KERNEL_SECTIONSTRING(_sec, _str) \ 196 .section _sec ; .asciz _str ; .text 197#else /* __ELF__ */ 198#define __KERNEL_SECTIONSTRING(_sec, _str) \ 199 .data ; .asciz _str ; .align 3 ; .text 200#endif /* __ELF__ */ 201 202#define __KERNEL_RCSID(_n, _s) __KERNEL_SECTIONSTRING(.ident, _s) 203#define __KERNEL_COPYRIGHT(_n, _s) __KERNEL_SECTIONSTRING(.copyright, _s) 204 205#ifdef NO_KERNEL_RCSIDS 206#undef __KERNEL_RCSID 207#define __KERNEL_RCSID(_n, _s) /* nothing */ 208#endif 209 210#endif /* _KERNEL */ 211